Definition of thallium in English:

noun

However, water-soluble rubidium, cesium, thallium, and silver minerals are virtually nonexistent and should pose no complication.

The scintillation detector, in this case a crystal of sodium iodide doped with thallium, emits a number of photons in direct proportion to the amount of energy deposited in the crystal by the dark matter particle.

My advice is to undergo another test called stress thallium, which will show the amount of involvement of the heart muscle with ischemia.